FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
COMPLETE SPECIFICATION
(See Section 10)
A PROCESS FOR MANUFACTURING
FIRE-RETARDANT, WATER REPELLANT, ANTI-TRACKING AND HIGH TEMPERATURE WITHSTANDING SILICONE RESIN IMPREGNATED FIBRE-GLASS CLOTH TAPE FOR ELECTRICAL INSULATION
PRS Solutions Private Limited, a Company incorporated under the Companies Act, 1956 and having its office at 63, Bombay Samachar Marg, Mumbai - 400 001 Maharashtra State, India, India
The following specification particularly describes the nature of this invention and the manner in which it is to he performed

FIELD OF THE INVENTION:
The invention relates to "Fire-Retardant, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Impregnated Fibre-Glass Cloth Tape For Electrical Insulation" and the process of manufacturing the same.
DESCRIPTION OF THE PRIOR-ART:
Various types of electrical insulation tapes are available in the market. But the said tapes does not have all the properties such as fire retardant, water repellant, anti-tracking properties. The electrical insulation tapes cause fire and loss of properties to the users of such tapes.
Glass insulation comes in a wide variety of forms including solid glass, fiberglass tapes, fiberglass sheets and mats, woven tubing and cloth, and various composites. High temperature operation is a key feature.
A variety of silicone rubbers are available for insulating and cushioning electrical and electronic assemblies. Silicone rubbers exhibit a wish list of characteristics including superb chemical resistance, high temperature performance, good thermal and electrical resistance, long term resiliency and easy fabrication. Liquid silicone rubbers are available in electrical grades for conformal coating, potting and gluing. Silicone rubbers filled with conducting fillers are available for applications requiring thermal conductivity.
Glass cloth impregnated with a silicone elastomer has good resistance to Corona discharges, weathering, oxidation and fungus attack allied with good moisture resistance. To overcome the above problems, new tap having the above referred properties clubbed together are included in the present invention.
SUMMARY OF THE INVENTION.
In the present invention an attempt has been made to prepare a fire-retardant, silicone-elastomer impregnated glass cloth for high-temperature electrical insulation purpose.

The manufacturing of the "Fire-retardant, water repellant, anti-tracking and high temperature withstanding silicone elastomer impregnated fibre-glass cloth tape for electrical insulation" comprises of coating a formulated silicone elastomer to the extent of 100-300 gm per square meter on both sides of a woven glass fabric of the required construction, commensurate with the desired properties of thickness and strength. The coating is carried out by use of conventional methods in one stage or multiple stages followed by drying operation which is also carried out by known conventional methods.
The formulated silicone elastomer is prepared by compounding two or more silicone elastomers having different hardness on a two-roll milling machine/Banbury machine, with fillers and two or more additives as applicable to impart the properties of fire-retardancy. The said compounded silicone elastomer is then optionally dispensed in solvent of aliphatic/aromatic nature to obtain consistency and flow properties required and commensurate with the coating method and equipment to be used.
The coated fabric so obtained is cut to desired sizes and shapes in line with the intended application may be in straight cut or bias cut. The said tape is desired to have a thickness of 0.15 mm, an electrical strength of over 4 kv/layer. The said tape has the following features:-
(a) Fire retardancy,
(b) High electrical insulation,
(c) Anti-tracking,
(d) High-temperature withstanding capability, and
(e) Water repellency.
The 24 hour water absorption dipping test indicated that the amount is less than 4.0 (%). The high temperature withstanding (Class-H) product successfully passes the under writers Laboratories Specification UL-94 flame retardancy test at V-0 level (non-ignitable category)

The said tape finds application on electrical connections in electric motors. The fibre cloth construction was designed to give optimum tensile strength and elongation to the bias-cut strips, so that they are conformable to wrap firmly on the round electrical connectors without snapping.
CONSTRUCTION:
lllllllllllllllllllllllllllllllllllllllllllllllll Specially formulated Silicone Elastomer
lllllllllllllllllllllllllllllllllllllllllllllllll Special Fibre Glass Cloth
llllllllllllllllllllllllllllllllllllllllllllllllll Specially formulated Silicone Elastomer
-4-

WE CLAIM:
1. The process of manufacturing Fire-Retardant, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Impregnated Fibre-Glass Cloth Tape For Electrical Insulation" comprises of the following steps :-
(a) (i) coating one side of a woven glass fabric with a formulated silicone elastomer to achieve the required silicone elastomer weight by use of conventional coating methods followed by drying with conventional methods;
(a) (ii) coating other side of the silicone elastomer coated woven glass fabric with a formulated silicone elastomer to achieve the required silicone elostomer weight by use of conventional coating methods followed by drying with conventional method;
(a) (iii) alternatively coating both sides of a woven glass fabric simultaneously with a formulated silicone elastomer to achieve the required silicone elastomer weight by use of conventional coating methods followed by drying with conventional methods;
(b) the coated fabric so obtained is cut to desired sizes and shapes;

2. A process of manufacturing Fire-Retardant, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Impregnated Fibre-Glass Cloth Tape For Electrical Insulation"as Claimed in Claim 1 wherein the said formulated silicone elastomer consists of compounding two or more silicone elastomers on a two-roll milling machine with fillers and two or more additives to impart the properties of fire-retardancy; and then optionally dispensing the said compounded silicone elastomer in solvent of aliphatic/aromatic nature to obtain consistency and flow properties required; and commensurate with the coating method and equipment to be used;
3. A process of manufacturing Fire-Retardant, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Elastomer Impregnated Fibre-Glass Cloth Tape For Electrical Insulation"as Claimed in Claims 1 and 2, wherein the said tape has a thickness of 0.15 mm, an electrical strength of over 4 kv/layer;

4. A process of manufacturing "Fire-Retardant, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Resin Impregnated Fibre-Glass Cloth Tape For Electrical Insulation" as claimed in Claims 1 to 3 by which Fire-Retardant, Water Repellant, Anti-Tracking And High Temperature Withstanding Silicone Resin Impregnated Fibre-Glass Cloth Tape For Electrical Insulation" is obtained.
Dated this 21st day of March, 2002
(Bharat S. Shah) Duly Constituted Attorney